active power filter filter
revoling leaf type filter + vacuum filter
absorption tube keying system
amplitude shift keying {= ASK}
automatic keying device
BFSK Binary Frequency Shift Keying
Biphase shift keying signal
coherent phase-shift keying
differential phase shift keying
Frequency Modulated-Differential Chaos Shift Keying
frequency shift keying
频移键控
移频按键
移频键控
键控频移频移键控频移键位
频移键控(FSK)
频移键控调制
频移键控信号
频移灯